Oliver Tickell: Global warming, says Tony Blair, is "the world's greatest environmental challenge", and renewable energy is one of the main weapons to combat it. So would you expect his government to grab hundreds of millions of pounds from Britain's fledgling renewable electricity industry?

Plastic bags are a scourge of the environment and can be found littering almost every part of the globe. Now some parts of the world are taking action and banning them - but what of Britain? Oliver Tickell reports.

Oxford's many waterways put the city's residents at risk from floods, so now the Environment Agency plans to spend £100m on a new river to ease the problem. But what will be the impact on conservation areas? Oliver Tickell investigates.